Peters



(N0 ModeL) G. E HART.

PROCESS OF MAKING CROWNS FOR WINDING WATCH ARBORS. No. 314,834. Patented Mar. 31, 1885.

N; PETERS Phclo-Lilhugrzpher, Washingun. D, C.

iJNiTEn STATES PATENT OFFICE.

GEORGE E. HART, OF VVATERBURY, CONNECTICUT, ASSIGNOR TO THE WATERBURY WATCH COMPANY, OF SAME PLACE.

PROCESS OF MAKING CROWNS FOR WINDING WATCH-ARBORS.

SPECIFIC A I'TOKI termizng part of Letters Patent No. 314,834, dated ldarch 31, 1885. Application filed July2l,1883. (So model.)

To all whom it may concern.-

Be it known that l, GEORGE E. HART, of Waterbury, in the county of New Haven, and in the State of Connecticut, have invented certain new and useful Improvements in Crowns for VVinding-Arbors; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, makinga part of this specification, in which Figure 1 is a perspective View of the blank used for the body of the crown. Fig, 2 is a like View of the same after having been operated upon by the formingdies. Fig. 3 is a perspective View of the said blank and the winding-arbor before being united. Fig. 4 is a like view of the same combined for use. Fig. 5 is a perspective view of the blank used for the crown-cover. Fig. 6 is a like View of the same after having been shaped to fit over said crown. Fig. 7 shows said crown and cover combined and ready for the finishing-dies. Fig. 8 is a perspectiveview of said parts after their edges have been turned inward, and Fig. 9 is a central longitudinal section of the same after the interior of the crown has been milled out to fit over the stem of the case.

Letters of like name and kind refer to like parts in each of the figures.

The design of my invention is to lessen the expense and laborinvolved in the construction of watch-case crowns, and to increase the strength and efficiency of the same; to which end said invention consists, principally,in the process as hereinafter described and specified.

It consists, further, in the method employed of constructing and uniting the crown and cover, substantially as hereinafter shown.

It consists, finally, in a crown-cover and winding-arbor, constructed and combined in the manner and for the purpose substantially as hereinafter set forth.

In the use of my method a round blank, A, is cut from a sheet of copper, and between suitable dies is given the cup form shown in .Fig. 2, its periphery being corrugated circumferentially, so as to produce the usual roughened exterior. The crown A is next placed within suitable dies and an axial opening, a, punched, after which the reduced end b of a windingarbor, B, is placed within said opening and headed down upon the outside, the combination being shown in Fig. 4. Inext take a disk of thin sheet metal, 0, of the kind used for the exterior of the watchcase, and within one pair of dies give to it the form shown in Fig. 5, and with a second pair of dies give to said part the form seen in Fig. 6. the same being precisely like the exterior of the crown A, and its interior dimensions such as to enable it to be placed over the same, as shown in Fig. 7. The crown A and cover 0 thus combined are now placed within dies and their edges turned inward, as shown in Fig. 8, after which, by means of a millingtool that is provided with an axial opening for the reception of the arbor B,the interior of said crown is dressed out and made exactly concentric with said arbor. If desired, additional strength may be given to the connection between the crown A and arbor B by having at the center of the interior of the former a boss, a, (shown by dotted lines in Fig. 9,) by which means the thickness of metal through which said arbor-passes is increased exactly in proportion to the hei ghtof said boss. To produce the said boss, it is only necessary to give the proper form to the die employed for producing the recessed interior of said crown. The crown thus constructed possesses all the strength which it is possible to obtain from any ordinary construction. It is cheaply made in consequence of the use of die-work in place of the usual lathe-work and milled exterior corrugations, and is very economical in material, as the waste metal is almost entirely such as is left between the holes in sheets from which the blank disks are cut, and is worth several times as much as could be obtained for lathe-trimmings.

Having thus fully set forth the nature and merits of my invention, what I claim as new 1s- 1. The process of constructing watch-crowns, which consists in takinga blank cut fromsheet copper orbrass, forming it into a cup with corrugated or roughened exterior, forming a cup of metal, like that of the Watch-case, corrugated externally and also internally, to fit over the cup previously formed, placing it over such cup, turning in the edges of the two cups,

and milling out the interior to fit the watch-.

stem, substantially as and for the purpose described.

2. The process of making watch-crowns, which consists in forming of sheet metal by; suitable dies a cup with corrugated or roughened exterior, placing over this a cup of similar metal to that of the case, corrugated 011 its exterior and roughened or corrugated on its interior to fit the inner cup, turning in the edges of the cups, and milling out the center of the crown thus formed, substantially as shown and described.

3. The process of making watclrcrowns, which consists in making from sheet-copper by suitable dies a cup corrugated on its exterior, making a second cup of any desired metal, adapted on its inside to fit the smaller cup with its corrugations, and also corrugated on its exterior, placing the smaller cup within the larger, and turning the edges in, substantially as and for the purpose described.

4. The process of manufacturing watchcrowns, which consists in making of sheetcopper a cup having corrugations on its outside radiating from its bottom making an opening in the bottom for the reception of the end of a windingarbor, making a second cup of metal corrugated inside and out on lines radiating from its bottom, and adapted to fit over the other cup withits corrugations, placing the smaller cup within the larger, and turning in, by means of dies, the edge of the double cup thus formed.

5. The process of manufacturing watchcrowns, which consists in taking a cup formed of copper and provided with a hole for the reception and fastening of the end of'the windingarbor, making a second cupof the same material as the outside of the watch-case, corrugated on' lines radiating from its bottom, placing this over the copper cup, turning in the edges of the double cup so formed, and milling out its inside to fit the watch-stem, substantially as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this 17th day of May, A. D. 1883.

GEORGE E. HART.

\Vitnesses:

Geo. WV. TERRY, FRED L. TERRY. 

